Effect of Al addition on the fatigue properties of interstitial-free steel and interstitial-free high-strength steel grades

Abstract

In the present work, the high-cycle fatigue properties of high-strength interstitial-free steels have been investigated and compared with its conventional (low Al) grade. The case of Al-rich steel is able to arrest fatigue crack propagation at the earliest stage by the generation of dislocation substructure, which induces the superior fatigue endurance of this grade in comparison with its conventional counterpart despite their similar static tensile properties.